Santalol esters.



1 UNITED STATES. i gruur oFFIoE.

EDUABD SPRUNGERTS, OF FRANKFORT-ON-THE-MAIN, GERMAN'Y,1\SSIGNOR TO VEREINIGTE CHININFABRIKEN ZIMMER & 00., G.-M. B.'H., OF FRANKFORT-ON JHE-MAIN, GERMANY.

SANTALOL ESTERS.

' Specification of Letters Patent.

Patented May 25;.

Application filed July 29, 1908. Serial No. 445,976. (Specimens) To all whom it may concern:

Be it known that I, EDUARD SPRoNeER'rs, a subject of the German Emperor, and a resident of Frankfort-on-the-Main, Germany, have invented certain new and useful Improvements in Santalol Esters, of which the following is a specification.

The santalol esters hitherto known are entirely liquid and therefore present difficulties in dividmg into doses and 1n taking. I have succeeded in producing a solid crystalline ester which is the santalol ester of the allophanic acid and has a definite melting oint and is free from odor and taste and WhlC can be dosed and taken. in the form of powder. It can be obtained by the methods known for preparin allophanic acid esters by reacting wit car amine acid derivatives upon san talol. Some examples therefor are hereinafter iven. The santalol ester of allo hanic acid o,,.,H,.,o-co-NH-eo NH, aving a contents of about 72 per cent. of san'talol, crystallizes in fine white needles which melt at 162 centigrade. It has neither odor, nor taste,:is soluble in most of the organic sol vents, but insoluble in water. It is sa onified by alcoholic potash lye,- santalol eing liberated. If it be heated above its melting point, santalol-like Vapors are first produced and then vapors of cyanic acid having a pungent odor.

. The following are examples of how this invention can be performed.

Example 1: Into santalol, or into solution of santalol in a suitable solvent, (such, for instance as petroleum-benzin) cyanic acid is slowly introduced. After a short time, the separation of the santalol ester of allophanic acid begins to take place. The introduction of cyanic acid is continued until no further thickening of the mass is observable. The mass is then exhausted by suction and is washed with petroloum-bcnzin which dissolves the new santalol ester with some dillieultv.

It is recrystallized from a mixture of benzene and petroleum-benzm. .Thc reaction is expressed by the following equation:

Example 2: To a solution of 1.59 kilograms.

. grams of santalol (1 molecular propel-Eon).

It is therefore also possible to first produce HCl anate bythe action of chlorid of urea.

Example 3: 2.2 kilograms of santalol (1 molecular proportion) are mixed with 5 kilograms of benzene and 2.5 kilograms of di-methyl-anilin and to this mixture, while being Well cooled, are added 1.59 kilograms of chlorid ofurea (2 molecular proportions) an excess of chlorid being preferably used. After the mixture has been allowed to stand for several hours, it is filtered and the filtrate is washed with dilute sulfuric acid to remove any of the base still present. The benzene is then. distilled off. There remains a semisolid residue from which the santalol allophanate is isolated. In lieu of di-methylanilin, other tertiary bases which similarly enliven reactions, such, for instance, as pyridin, may be employed.

Example 4: 2.2 kilograms of santalol (1 molecular. proportion) are heated for about four hours in a vacuum to from 140 to 145 bamatc (2 molecular proportions), or preferably with an excess of the said carbamate,

added.

lized from l'icnzone-hcnzin. The reaction is Example 5: 2.2 kilograms of sautalol (1 l molecular proportion) and 1.8 kilograms of phenol ester of allophanir acid (1 molecular proportion) are caused to react exactly as in I the last preceding example and the product the santalol carbamate, which is a tastelessoil, and to obtain therefrom santalol allophcentigrade, with 2.74 kilograms phenol car a small amount of caustic potash being, The phenol distils oil and there remains a solid residue, which is ground, washed with petrolcum-benzin and recrystal is treated in the same manner. The reaction lsas follows:

Petroleum-benzin are added to the reaction mlxture and the allophanate, which is formed after a few days, is drawn oil' by suction, and 1 and is evaporated and ehlorid still contained from alcohol.

I claim:

. s I l 1. The hcreln described process of pro-1 and h aving the formula,

C ,H O CO NH CO'- N H crystallizing in line white needles which melt at 162 centigrade, hav'ingneither odor nor taste and being soluble in most of the organic solvents, but insoluble in water.

In testimony whereof I have signed my dried and the sodium name to this specification in the presence of therein 18 washed out. two subscribing witnesses The santalol allophanate 1S recrystallized EDUA'RD SPRONGERIS.

Witnesses JEAN GRUND,

CARL GRUND. 

